Denis Ridzal

Optimization & Uncertainty Quantification

Author profile picture

Optimization & Uncertainty Quantification

dridzal@sandia.gov

(505) 845-1395

Sandia National Laboratories, New Mexico
P.O. Box 5800
Albuquerque, NM 87185-1320

Biography

Denis develops, analyzes and implements algorithms for large-scale numerical optimization and solution methods for partial differential equations (PDEs). He is the project lead and a lead developer of the Rapid Optimization Library (ROL) software for large-scale and simulation-based optimization. Denis is also a lead developer of Intrepid, a library for compatible PDE discretizations. He applies the developed methods and software to solve engineering problems in the areas of structural mechanics, fluid dynamics and electromagnetics. Denis’ recent work includes parallel-in-time methods for extreme-scale dynamic optimization, with applications to the design of electromagnetic metamaterials, and optimization-based solvers for hyperbolic conservation laws and the Monge-Ampère equation.

Publications

Drew Philip Kouri, Denis Ridzal, Gregory John von Winckel, Aurya Javeed, (2022). Get ROL-ing: An Introduction to Sandia’s Rapid Optimization Library International Conference on Continuous Optimization Document ID: 1584955

Denis Ridzal, Drew Philip Kouri, David Robinson, Maher Salloum, (2022). Uniform flow in axisymmetric devices through permeability optimization 7th International Conference on Continuous Optimization Document ID: 1584916

Kelsey DiPietro, Diana Morales, Denis Ridzal, (2022). Optimization-based multi grid-enabled finite element solvers for the Monge-Ampre equation International Conference on Continuous Optimization Document ID: 1573671

Kelsey DiPietro, Denis Ridzal, Diana Morales, (2022). Optimization for Real-Time Dynamic Spatial AdaptivityKelsey CIS Research Foundation External Review Document ID: 1551278

Aurya Javeed, Drew Philip Kouri, Denis Ridzal, Gregory John von Winckel, (2022). Get ROL-ing International Conference on Continuous Optimization Document ID: 1539688

David Robinson, Declan Thomas Mahaffey-Dowd, Carly Sin Yiu Hui, Bernice E. Mills, Maher Salloum, Denis Ridzal, Drew Philip Kouri, John Carter Miers, (2022). Additive manufacturing of porous lattices with spatially optimized permeability Material Science Research Foundation External Review Board meeting Document ID: 1504698

Denis Ridzal, (2022). Optimization with Differential Equations at Sandia National Labs SIAM Chapter at University of Utah Document ID: 1494412

Kelsey DiPietro, Denis Ridzal, (2022). Optimization based methods for the Monge-Ampre equation International Conference on Continuous Optimization Document ID: 1492781

Declan Thomas Mahaffey-Dowd, Carly Sin Yiu Hui, Bernice E. Mills, Maher Salloum, Denis Ridzal, Drew Philip Kouri, John Carter Miers, David Robinson, (2022). Additive Manufacturing of Porous Material Lattices with Spatially Optimized Permeability American Chemical Society Spring 2022 Document ID: 1482539

Kelsey DiPietro, Denis Ridzal, (2022). Optimization based solvers for the Monge-Ampre equation with applications to mesh adaptivity East Coast Optimization Meeting Document ID: 1482276

Sean Hardesty, Harbir Antil, Drew Philip Kouri, Denis Ridzal, (2022). The Strip Method for Shape Derivatives International Journal for Numerical Methods in Engineering https://www.osti.gov/search/identifier:1841999 Document ID: 1405360

Declan Thomas Mahaffey-Dowd, Carly Sin Yiu Hui, Bernice E. Mills, Maher Salloum, Denis Ridzal, Drew Philip Kouri, David B. Robinson, (2021). Additive manufacturing of porous material lattices with spatially optimized permeability ACS Spring 2022 Conference Document ID: 1369003

Kelsey DiPietro, Denis Ridzal, Alan Lindsay, (2021). Efficient finite element methods for solving the Monge-Ampere equation U.S. National Congress on Computational Mechanics Document ID: 1332488

Michael Lee Bynum, Santiago Rodriguez, Carl Damon Laird, Bethany L. Nicholson, Jordan Heath Jalving, John Daniel Siirola, Denis Ridzal, (2021). Scalable Parallel Nonlinear Optimization with PyNumero and Parapint SIAM Conference on Optimization (OP21) Document ID: 1331993

Sean Hardesty, Harbir Antil, Drew Philip Kouri, Denis Ridzal, (2021). The Strip Method for Shape Derivatives SIAM Conference on Optimization (OP21) https://www.osti.gov/search/identifier:1876615 Document ID: 1331238

Sean Hardesty, Harbir Antil, Drew Philip Kouri, Denis Ridzal, (2021). The Strip Method for Shape Derivatives SIAM Conference on Control and Its Applications (CT21) https://www.osti.gov/search/identifier:1876593 Document ID: 1329890

David Robinson, Maher Salloum, Denis Ridzal, Drew Philip Kouri, (2021). Fluid flow control devices with 3D-graded permeability Interpore 2021 https://www.osti.gov/search/identifier:1867123 Document ID: 1305860

Michael Lee Bynum, Santiago Rodriguez, Carl Damon Laird, Bethany L. Nicholson, Jordan Heath Jalving, John Daniel Siirola, Denis Ridzal, (2021). Parapint: Scalable Parallel Solution of Structured Nonlinear Programs 2021 AIChE Annual Meeting Document ID: 1294035

David Robinson, Maher Salloum, Denis Ridzal, Drew Philip Kouri, (2021). Design of chromatography columns with 3D-graded permeability American Chemical Society Spring 2021 Meeting https://www.osti.gov/search/identifier:1861979 Document ID: 1292851

David Robinson, Maher Salloum, Denis Ridzal, Drew Philip Kouri, (2021). Fluid flow control devices with 3D-graded permeability Interpore2021 Document ID: 1268039

David Robinson, Maher Salloum, Drew Philip Kouri, Denis Ridzal, (2021). Design of chromatography columns with 3D-graded permeability American Chemical Society Spring 2021 virtual meeting Document ID: 1255874

Michael Lee Bynum, Denis Ridzal, (2020). Parapint:Rapid Development of Parallel Decomposition Algorithms for Dynamic Optimization Software at Sandia Tutorial Series https://www.osti.gov/search/identifier:1837398 Document ID: 1244717

David Robinson, Maher Salloum, Denis Ridzal, Drew Philip Kouri, David J. Saiz, Bradley Howell Jared, (2020). Fluid flow control devices with 3D-graded permeability 2020 virtual annual meeting of the American Institute of Chemical Engineers https://www.osti.gov/search/identifier:1831022 Document ID: 1231186

Denis Ridzal, Drew Philip Kouri, (2020). An Augmented Lagrangian Equality-constrained SQP (ALESQP) Method for Function-space Optimization with General Constraints 3rd Annual Meeting of the SIAM TX/LA Section https://www.osti.gov/search/identifier:1877850 Document ID: 1219849

Sean Hardesty, Drew Philip Kouri, Payton Lindsay, Denis Ridzal, Brian Lynn Stevens, Ryan Viertel, (2020). Shape Optimization for Control and Isolation of Structural Vibrations in Aerospace and Defense Applications https://www.osti.gov/search/identifier:1669731 Document ID: 1207363

Michael Lee Bynum, Carl Damon Laird, Bethany L. Nicholson, Denis Ridzal, (2020). Parapint: Rapid Development of Efficient and Scalable Decomposition Algorithms for Dynamic Optimization The 14th International Symposium on Process Systems Engineering (PSE 2021) Document ID: 1207433

Eric Christopher Cyr, Stefanie Guenther (LLNL), Lars (Emory) Ruthotto, Jacob B. Schroder (UNM), Nico R. Gauger (TU Kaiserslautern), Denis Ridzal, (2020). A Layer-Parallel Approach for Training Deep Neural Networks George Mason University – CMAI Colloquium https://www.osti.gov/search/identifier:1812174 Document ID: 1183473

Drew Philip Kouri, Denis Ridzal, Raymond S. Tuminaro, (2020). KKT Preconditioners for PDE-Constrained Optimization with the Helmholtz Equation SIAM Journal on Scientific Computing (SISC) https://www.osti.gov/search/identifier:1784959 Document ID: 1161314

David Robinson, Maher Salloum, Denis Ridzal, Drew Philip Kouri, David J. Saiz, Bradley Howell Jared, (2020). Fluid flow control devices with 3D-graded permeability 2020 American Institute of Chemical Engineers (AIChE) Annual Meeting Document ID: 1115366

Maher Salloum, David Robinson, Denis Ridzal, Drew Philip Kouri, David J. Saiz, Bradley Howell Jared, (2020). Fluid Flow Control Devices with Graded Permeability 5th Cross-Joint (JOWOG) Meeting https://www.osti.gov/search/identifier:1761291 Document ID: 1079624

Eric Christopher Cyr, Mamikon Gulian, Ravi Ghanshyam Patel, Mauro Perego, Nathaniel Albert Trask, Denis Ridzal, Stefanie Guenther (LLNL), Lars Ruthotto (Emory), Jacob B. Schroder (UNM), Nico R. Gauger (TU Kaiserslautern), (2019). Improved Neural Network Training: Layer-Parallelism, Least-squares and Initialization International Workshop On Scientific Machine Learning https://www.osti.gov/search/identifier:1643364 Document ID: 1078760

Eric Christopher Cyr, Denis Ridzal, Stefanie Guenther (LLNL), Lars Ruthotto (Emory), Jacob B. Schroder (UNM), Nico R. Gauger (TU Kaiserslautern), (2019). Exploiting ?time-domain? parallelism to accelerate neural network training and PDE constrained optimization CIS External Review https://www.osti.gov/search/identifier:1807168 Document ID: 998567

Pavel B. Bochev, Pavel B. Bochev, Denis Ridzal, Denis Ridzal, Marta D’Elia, Marta D’Elia, Mauro Perego, Mauro Perego, Kara J. Peterson, Kara J. Peterson, (2019). Optimization-based, property-preserving finite element methods for scalar advection equations and their connection to Algebraic Flux Correction Comp. Meth. Application. Mech. Engrg. (CMAME) https://www.osti.gov/search/identifier:1644056 Document ID: 972632

Denis Ridzal, Eric Christopher Cyr, Bart G van Bloemen Waanders, (2019). Adjoint-based Parallel-in-time Optimization for Electromagnetics: From Source Inversion to Design Nemo 2019 https://www.osti.gov/search/identifier:1640205 Document ID: 972512

Eric Christopher Cyr, Denis Ridzal, (2019). A Parallel-in-Time Multigrid Preconditioner for KKT Systems Arising in Full Space Optimization Copper Mountain Conference on Multigrid Methods https://www.osti.gov/search/identifier:1639544 Document ID: 947675

Denis Ridzal, (2019). Scalable Optimization of Discrete-Time PDE Systems with Inequality Constraints Siam Cse 2019 https://www.osti.gov/search/identifier:1602616 Document ID: 935461

Pavel B. Bochev, Denis Ridzal, Kara J. Peterson, Paul Allen Kuberry, Marta D’Elia, Mauro Perego, (2019). Optimization-based property-preserving methods 2019 ASCR PI meeting Document ID: 913007

Curtis C. Ober, Roger P. Pawlowski, Sidafa Conde, Irina Kalashnikova Tezaur, Eric T. Phipps, Edward Geoffrey Phillips, Alejandro Mota, Greg Phlipot, Denis Ridzal, Michael Alan Hansen, Travis C. Fisher, (2018). Tempus Time-Integration Package & Applications Trilinos User-Developer Group Meeting 2018 https://www.osti.gov/search/identifier:1593047 Document ID: 888164

Denis Ridzal, Eric Christopher Cyr, (2018). Multigrid-in-time methods for optimization with nonlinear PDE/DAE constraints 23rd International Symposium on Mathematical Programming https://www.osti.gov/search/identifier:1531095 Document ID: 819876

Denis Ridzal, Pavel B. Bochev, (2018). Optimization-based property-preserving solution recovery for fault-tolerant scalar transport 6th European Conference on Computational Mechanics (ECCM 6) https://www.osti.gov/search/identifier:1525952 Document ID: 783913

Pavel B. Bochev, Mauro Perego, Marta D’Elia, Denis Ridzal, Kara J. Peterson, (2018). Optimization-based, property preserving finite element methods for transport equations 6th European Conference on Computational Mechanics 7th European Conference on Computational Fluid Dynamics 11-15 June 2018, Glasgow, UK https://www.osti.gov/search/identifier:1525706 Document ID: 808248

Denis Ridzal, Drew Philip Kouri, (2018). Scalable Algorithms and Software for PDE-Constrained Optimization Under Uncertainty SIAM Conference on Uncertainty Quantification 2018 https://www.osti.gov/search/identifier:1508919 Document ID: 784969

Ihab Fathy El-Kady, Charles M. Reinke, Bart G van Bloemen Waanders, Denis Ridzal, Mehmet (Stellar Science) Su, David (Stellar Science) Fitzpatrick, Ryan (Stellar Science) Chilton, (2018). A group theory approach to tailored optical properties of metamaterials DARPA/DSO EXTREME 12-Month PI Meeting https://www.osti.gov/search/identifier:1525575 Document ID: 784167

Ihab Fathy El-Kady, Charles M. Reinke, Bart G van Bloemen Waanders, Denis Ridzal, Mehmet (Stellar Science) Su, David (Stellar Science) Fitzpatrick, Ryan (Stellar Science) Chilton, (2018). MIRaGE Multiscale Inverse Rapid Group-theory for Engineered-metamaterials DARPA/DSO EXTREME 12-Month PI Meeting https://www.osti.gov/search/identifier:1525574 Document ID: 784280

Charles M. Reinke, Ihab Fathy El-Kady, Charles M. Reinke, Bart G van Bloemen Waanders, Denis Ridzal, Mehmet (Stellar Science) Su, David (Stellar Science) Fitzpatrick, Ryan (Stellar Science) Chilton, (2018). FEMLITE: Rapid Electromagnetic Modeling of Periodic Metamaterial Structures DARPA/DSO EXTREME 12-Month PI Meeting https://www.osti.gov/search/identifier:1575339 Document ID: 784124

Ihab Fathy El-Kady, Charles M. Reinke, Bart G van Bloemen Waanders, Denis Ridzal, Mehmet (Stellar Science) Su, David (Stellar Science) Fitzpatrick, Ryan (Stellar Science) Chilton, (2018). COMPUTATIONAL TOOLS FOR FREE-FORM OPTIMIZATION OF LARGE-SCALE EnMat STRUCTURES DARPA/DSO EXTREME 12-Month PI Meeting https://www.osti.gov/search/identifier:1525573 Document ID: 784380

Denis Ridzal, (2018). COMPUTATIONAL TOOLS FOR FREE-FORM OPTIMIZATION OF LARGE-SCALE EnMat STRUCTURES DARPA-EXTREME Program PI Meeting https://www.osti.gov/search/identifier:1510167 Document ID: 784371

Eric T. Phipps, Daniel Z. Turner, Kathryn Anne Maupin, Jaideep Ray, Denis Ridzal, (2018). SNL ATDM Math Libraries ? Data Propagation Components 2018 ECP Annual Meeting https://www.osti.gov/search/identifier:1806499 Document ID: 749743

Drew Philip Kouri, Denis Ridzal, (2018). Inexact Trust-Region Methods for PDE-Constrained Optimization Frontiers in PDE-constrained Optimization https://www.osti.gov/search/identifier:1434233 Document ID: 626052

Eric Christopher Cyr, Gregory John von Winckel, Drew Philip Kouri, Thomas Anthony Gardiner, Denis Ridzal, John N. Shadid, Sean Miller, (2017). LDRD Report: Topological Design Optimization of Convolutes in Next Generation Pulsed Power Devices https://www.osti.gov/search/identifier:1413648 Document ID: 703405

Denis Ridzal, Drew Philip Kouri, Gregory John von Winckel, (2017). Rapid Optimization Library Trilinos User-Developer Group Meeting https://www.osti.gov/search/identifier:1481491 Document ID: 724926

Eric Christopher Cyr, Denis Ridzal, (2017). Towards Parallel in Time for Full Space Optimization The 3rd Annual Meeting of SIAM Central States Section https://www.osti.gov/search/identifier:1509626 Document ID: 693096

Denis Ridzal, Marta D’Elia, Mauro Perego, Pavel B. Bochev, (2017). Property preserving finite element methods via constrained optimization International Conference on Numerical Methods for Multi-Material Fluid Flows (MULTIMAT 2017) https://www.osti.gov/search/identifier:1513336 Document ID: 672518

Kara J. Peterson, Denis Ridzal, Pavel B. Bochev, (2017). Optimization-based Tracer Transport MultiMat https://www.osti.gov/search/identifier:1471980 Document ID: 672367

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, Mark Alan Taylor, (2017). Optimization-Based Semi-Lagrangian Tracer Transport Cis Rf Erb https://www.osti.gov/search/identifier:1465013 Document ID: 659827

Marta D’Elia, Pavel B. Bochev, Marta D’Elia, Mauro Perego, Denis Ridzal, (2017). Optimization-based, property preserving finite element methods Finite Elements in Flow Problems (FEF2017) https://www.osti.gov/search/identifier:1458218 Document ID: 611765

Drew Philip Kouri, Denis Ridzal, Gregory John von Winckel, (2017). The Rapid Optimization Library: Software for large-scale optimization Optimization Under Uncertainty and Data-Driven Science and Engineering https://www.osti.gov/search/identifier:1456449 Document ID: 612192

Pavel B. Bochev, Marta D’Elia, Mauro Perego, Kara J. Peterson, Denis Ridzal, (2017). Optimization-Based Property Preserving Methods, or Going Boldly Beyond Compatible Discretizations Int. Conference Mathematics days in Sofia Document ID: 600476

Eric Christopher Cyr, Gregory John von Winckel, Thomas Anthony Gardiner, Drew Philip Kouri, Denis Ridzal, Sean Miller, John N. Shadid, (2017). Topology Optimization: Challenges, Algorithms and Applications Mathematics Colloquium and the Applied Mathematics Seminar https://www.osti.gov/search/identifier:1429279 Document ID: 610893

Denis Ridzal, Eric Christopher Cyr, (2017). Inexact parallel-in-time solvers and SQP methods for PDE-constrained optimization SIAM Conference on Computational Science and Engineering https://www.osti.gov/search/identifier:1524491 Document ID: 599499

Eric T. Phipps, Byron Hanks, Francesco NMN Rizzi, Denis Ridzal, Joshua Robbins, Miguel Alejandro Aguilo Valentin, Kevin D. Copps, (2017). SNL ATDM Analysis Components ECP Annual Meeting https://www.osti.gov/search/identifier:1505484 Document ID: 577638

Mauro Perego, Eric T. Phipps, Andrew G. Salinger, Denis Ridzal, Drew Philip Kouri, Georg (Courant) Stadler, Stephen (LANL) Price, (2017). Solving PDE constrained Optimization Problems in Albany Albany Users Meeting Document ID: 577351

Denis Ridzal, (2016). ROL R&D100 2016 Application Document ID: 431063

Denis Ridzal, Drew Philip Kouri, (2016). A Full-Space Approach to Stochastic Optimization with Simulation Constraints SIAM Conference on UQ https://www.osti.gov/search/identifier:1581536 Document ID: 431085

Pavel B. Bochev, Denis Ridzal, (2016). "Optimization-based additive decomposition of weakly coercive problems with applications to iterative solver design 2016 Copper Mountain Conference on Iterative Methods https://www.osti.gov/search/identifier:1366604 Document ID: 419879

Gregory John von Winckel, Eric Christopher Cyr, Drew Philip Kouri, Denis Ridzal, Thomas Anthony Gardiner, John N. Shadid, (2016). Reduced and Full Space Methods in Topology Optimization: Applications in Linear Elasticity and Electrical Conduction Fourteenth Copper Mountain Conference On Iterative Methods https://www.osti.gov/search/identifier:1364862 Document ID: 430217

Timothy Walsh, Wilkins Aquino, Denis Ridzal, Drew Philip Kouri, (2015). Inversion for Eigenvalues and Modes Using Sierra-SD and ROL https://www.osti.gov/search/identifier:1233625 Document ID: 343020

Denis Ridzal, Eric Christopher Cyr, Mona Hajghassem (University of Maryland Baltimore County ), (2015). A time-parallel method for the solution of PDE-constrained optimization problems https://www.osti.gov/search/identifier:1430466 Document ID: 365967

Drew Philip Kouri, Wilkins Aquino, Denis Ridzal, Ralph T. Rockafellar, Alexander Shapiro, Stan Uryasev, (2015). Risk-Averse Optimization of Large-Scale Multiphysics Systems DARPA EQUiPS Kick-Off Meeting https://www.osti.gov/search/identifier:1333463 Document ID: 354824

Kara J. Peterson, Marta D’Elia, Denis Ridzal, Pavel B. Bochev, Mikhail Shashkov, (2015). Optimization-based Mesh Correction MultiMat 2015 https://www.osti.gov/search/identifier:1326773 Document ID: 320821

Denis Ridzal, (2015). Inexact full-space methods for simulation-based inverse problems and large-scale optimization U.S. National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1279669 Document ID: 318887

Pavel B. Bochev, Denis Ridzal, (2015). Optimization-based additive decomposition of weakly coercive problems with applications, Computers and mathematics with applications https://www.osti.gov/search/identifier:1237674 Document ID: 308265

Pavel B. Bochev, Scott Moe, Kara J. Peterson, Denis Ridzal, (2015). A Conservative, Optimization-based Semi-Lagrangian Spectral Element Method for Passive Tracer Transport 6th International Conference on Computational Methods for Coupled Problems in Science and Engineering (COUPLED PROBLEMS 2015) https://www.osti.gov/search/identifier:1253083 Document ID: 275364

Bart G van Bloemen Waanders, Drew Philip Kouri, Denis Ridzal, Stan Uryasef (UF), (2015). Optimization Under Uncertainty for Magnetic Confinement Fusion DOE Workshop on Integrated Simulations for Magnetic Fusion Energy Sciences https://www.osti.gov/search/identifier:1250731 Document ID: 264644

Denis Ridzal, Drew Philip Kouri, Bart G van Bloemen Waanders, (2015). Integration of Approximate Schur Preconditioners and SQP Algorithms for Nonlinear PDE Optimization under Uncertainty SIAM Conference on Computational Science and Engineering Document ID: 232804

Kara J. Peterson, Denis Ridzal, Pavel B. Bochev, (2015). Feature-Preserving Finite Element Transport Across Interfaces: Part2, Direct Flux Recovery SIAM Conference on Computational Science and Engineering Document ID: 232494

Marta D’Elia, Denis Ridzal, Kara J. Peterson, Pavel B. Bochev, Mikhail Jurievich Shashkov, (2015). Optimization-based mesh correction with volume and convexity constraints Journal of Computational Physics https://www.osti.gov/search/identifier:1254321 Document ID: 232084

Timothy Walsh, Denis Ridzal, Drew Philip Kouri, Bart G van Bloemen Waanders, Wilkins Aquino, (2015). An Operator-Based Framework for Inverse Problems Usncm13 Document ID: 221501

Pavel B. Bochev, Scott Moe, Kara J. Peterson, Denis Ridzal, (2015). A Conservative, Optimization-Based Semi-Lagrangian Spectral Element Method for Passive Tracer Transport VI International Conference on Computational Methods for Coupled Problems in Science and Engineering https://www.osti.gov/search/identifier:1238306 Document ID: 220557

Denis Ridzal, (2014). Intrelab Trilinos User Group Meeting https://www.osti.gov/search/identifier:1367602 Document ID: 207790

Denis Ridzal, Drew Philip Kouri, (2014). Rapid Optimization Library Trilinos User Group Meeting https://www.osti.gov/search/identifier:1367652 Document ID: 207788

Timothy Walsh, Wilkins Aquino, Denis Ridzal, Drew Philip Kouri, Bart G van Bloemen Waanders, Angel Urbina, (2014). Viscoelastic Material Inversion using Sierra-SD and ROL https://www.osti.gov/search/identifier:1322276 Document ID: 207871

Mauro Perego, Andrew G. Salinger, Eric T. Phipps, Denis Ridzal, Drew Philip Kouri, Irina Kalashnikova Tezaur, S. Price, G. Stadler, (2014). Adjoint-based Deterministic Inversion for Ice Sheets Trillinos User Group Meeting 2014 https://www.osti.gov/search/identifier:1242148 Document ID: 207979

Timothy Walsh, Wilkins Aquino, Denis Ridzal, Drew Philip Kouri, Bart G van Bloemen Waanders, (2014). A massively parallel framework for source and material inverse problems in structural acoustics ICES seminar https://www.osti.gov/search/identifier:1502315 Document ID: 144477

Timothy Walsh, Wilkins Aquino, Denis Ridzal, Drew Philip Kouri, Bart G van Bloemen Waanders, (2014). A massively parallel framework for source and material inverse problems in structural acoustics ICES seminar Document ID: 144213

Denis Ridzal, (2014). Optimization-based models and algorithms for feature-preserving finite element transport Workshop on Modeling and Simulation of Transport Phenomena https://www.osti.gov/search/identifier:1496082 Document ID: 143294

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2014). Optimization-Based Transport of Passive Tracers International Worshop on Modeling and Simulation of Transport Phenomena https://www.osti.gov/search/identifier:1494442 Document ID: 143320

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2014). Optimization-Based Tracer Transport on the Sphere Partial Differential Equations on a Sphere Workshop https://www.osti.gov/search/identifier:1142296 Document ID: 5334678

Miguel Alejandro Aguilo Valentin, Denis Ridzal, (2014). Optimality conditions for the numerical solution of optimization problems with PDE constraints: Theoretical framework and applications to parameter identification and optimal control problems https://www.osti.gov/search/identifier:1200665 Document ID: 5333490

Edward Love, Allen C. Robinson, Denis Ridzal, James R. Kamm, Joseph S. Young, (2013). Edge Remap for Solids https://www.osti.gov/search/identifier:1200671 Document ID: 5329469

Pavel B. Bochev, Denis Ridzal, Kara J. Peterson, (2013). Perspectives on preservation of physical properties through optimization workshop on High-Resolution Mathematical and Numerical Analysis of Involution-Constrained PDEs https://www.osti.gov/search/identifier:1673222 Document ID: 5327183

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2013). Optimization-Based Transport on the Cubed Sphere Grid 2013 DOE Applied Mathematics Program Meeting https://www.osti.gov/search/identifier:1107020 Document ID: 5325659

Timothy Walsh, Michael Ross, Denis Ridzal, Miguel Alejandro Aguilo Valentin, Wilkins Aquino, (2013). Inverse Structural Acoustic Source and Material Identification in a Massively Parallel Finite Element Framework USNCCM conference https://www.osti.gov/search/identifier:1106883 Document ID: 5325083

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2013). Optimization-Based Transport on the Cubed Sphere Grid 9th International Conference on Large-Scale Scientific Computations https://www.osti.gov/search/identifier:1107015 Document ID: 5322971

Joseph G Young, Denis Ridzal, (2013). Designing Experiments Through Compressed Sensing https://www.osti.gov/search/identifier:1089978 Document ID: 5322907

Timothy Walsh, Miguel Alejandro Aguilo Valentin, Denis Ridzal, Joseph G Young, Wilkins Aquino, (2013). Inverse Structural Acoustic Source and Material Identification in a Massively Parallel Finite Element Framework Center for Acoustics and Vibration Workshop https://www.osti.gov/search/identifier:1078962 Document ID: 5321948

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2013). Optimization-based conservative transport on the cubed sphere grid Ninth International Conference on Large-Scale Scientific Computations https://www.osti.gov/search/identifier:1145256 Document ID: 5319878

Timothy Walsh, Denis Ridzal, Joseph G Young, Wilkins Aquino, (2012). Inverse Acoustic Source Identification in a Massively Parallel Finite Element Framework Acoustic Society of America Conference https://www.osti.gov/search/identifier:1116242 Document ID: 5314849

Timothy Walsh, Denis Ridzal, Joseph G Young, Wilkins aquino, (2012). Inverse Acoustic Source Identification in a Massively Parallel Finite Element Framework Acoustic Society of America Conference https://www.osti.gov/search/identifier:1062296 Document ID: 5314885

Pavel B. Bochev, Denis Ridzal, (2012). Optimization-Based Transport on the Sphere Solution of Partial Differential Equations on the Sphere Workshop https://www.osti.gov/search/identifier:1073220 Document ID: 5312975

Joseph G Young, Denis Ridzal, (2012). Software Abstractions for Matrix-Free PDE Optimization with Cone Constraints 21st International Symposium on Mathematical Programming https://www.osti.gov/search/identifier:1061049 Document ID: 5311906

Pavel B. Bochev, Denis Ridzal, (2012). Optimization-based remap and transport: a divide and conquer strategy for feature-preserving discretizations Journal of Computational Physics https://www.osti.gov/search/identifier:1073403 Document ID: 5311116

Timothy Walsh, Denis Ridzal, Joseph G Young, Wilkins Aquino, (2012). Inverse Acoustic Source Identification in a Massively Parallel Finite Element Framework Acoustical Society of America Meeting https://www.osti.gov/search/identifier:1064356 Document ID: 5308581

Joseph G Young, Denis Ridzal, Miguel Alejandro Aguilo Valentin, (2012). Efficient Handling of Inequality Constraints in a Matrix-Free Trust-Region SQP Algorithm Copper Mountain Conference on Iterative Methods https://www.osti.gov/search/identifier:1068470 Document ID: 5306128

Miguel Alejandro Aguilo Valentin, Denis Ridzal, Joseph G Young, (2012). Solving Large-Scale Inverse Problems in Elasticity Using Sequential Quadratic Programming (SQP) Copper Mountain Conference on Iterative Methods https://www.osti.gov/search/identifier:1078650 Document ID: 5306185

Pavel B. Bochev, Denis Ridzal, Robert Kirby, (2011). Solving PDEs with Intrepid Trilinos Users Group https://www.osti.gov/search/identifier:1030374 Document ID: 5288705

Miguel Alejandro Aguilo Valentin, Denis Ridzal, Joseph G Young, (2011). A Sequential Quadratic Programming (SQP) Algorithm and the Modied Error in Constitutive Equation (MECE) Principle for Parameter Estimation US National Congress on Computational Mechanics https://www.osti.gov/search/identifier:1120237 Document ID: 5297301

Joseph G Young, Denis Ridzal, Pavel B. Bochev, (2011). Optimization-Based Modeling: Part 3 – Monotone Methods for Transport without Limiters 8th International Conference on Large-Scale Scientific Computations https://www.osti.gov/search/identifier:1107675 Document ID: 5295426

Joseph G Young, Denis Ridzal, (2011). Compressed Sensing in a Finite Product of Hilbert Spaces SIAM Conference on Optimization (OP11) https://www.osti.gov/search/identifier:1109311 Document ID: 5294826

Joseph G Young, Denis Ridzal, (2011). The Application of Random Projection to Parameter Estimation SIAM Conference on Optimization (OP11) https://www.osti.gov/search/identifier:1108070 Document ID: 5294647

Kara J. Peterson, Pavel B. Bochev, Denis Ridzal, (2011). Intrepid Functionality for Parvis Parvis Meeting https://www.osti.gov/search/identifier:1671462 Document ID: 5293611

Pavel B. Bochev, Denis Ridzal, (2007). Finite Element Solution of Optimal Control Problems Arising in Semiconductor Modeling 6th Int. Conference on large scale scientific computing https://www.osti.gov/search/identifier:1147944 Document ID: 5252128

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Awards & Recognition

2011

Pavel B. Bochev, Denis Ridzal, "Optimization-based modeling - a new strategy for predictive simulations. Part 1", 8th Int. Conf. Large Scale Sci. Comp., June 2011, Sozopol, May 7, 2011

Denis Ridzal, Pavel Bochev, Monotone, Bound Preserving Transport and Remap, 2011 SIAM CS/E Conference, February 27, 2011

Denis Ridzal, Joseph Young, Pavel Bochev, Kara Peterson, Optimization-based modeling with applications to transport. Part 3. Implementation and computational studies, 8th Int. Conf. Large Scale Sci. Comp., June 7, 2011